The Tcpdump Group git mirrors - tcpdump/blob - print.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Support for splitting captures into multiple files with a maximum
  22  * file size:
  23  *
  24  * Copyright (c) 2001
  25  *      Seth Webster <swebster@sst.ll.mit.edu>
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include <config.h>
  30 #endif
  31
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <setjmp.h>
  35
  36 #include "netdissect-stdinc.h"
  37
  38 #include "netdissect.h"
  39 #include "addrtoname.h"
  40 #include "print.h"
  41 #include "netdissect-alloc.h"
  42
  43 #include "pcap-missing.h"
  44
  45 struct printer {
  46         if_printer f;
  47         int type;
  48 };
  49
  50 static const struct printer printers[] = {
  51         { ether_if_print,       DLT_EN10MB },
  52 #ifdef DLT_IPNET
  53         { ipnet_if_print,       DLT_IPNET },
  54 #endif
  55 #ifdef DLT_IEEE802_15_4
  56         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
  57 #endif
  58 #ifdef DLT_IEEE802_15_4_NOFCS
  59         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
  60 #endif
  61 #ifdef DLT_IEEE802_15_4_TAP
  62         { ieee802_15_4_tap_if_print, DLT_IEEE802_15_4_TAP },
  63 #endif
  64 #ifdef DLT_PPI
  65         { ppi_if_print,         DLT_PPI },
  66 #endif
  67 #ifdef DLT_NETANALYZER
  68         { netanalyzer_if_print, DLT_NETANALYZER },
  69 #endif
  70 #ifdef DLT_NETANALYZER_TRANSPARENT
  71         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
  72 #endif
  73 #ifdef DLT_NFLOG
  74         { nflog_if_print,       DLT_NFLOG},
  75 #endif
  76 #ifdef DLT_CIP
  77         { cip_if_print,         DLT_CIP },
  78 #endif
  79 #ifdef DLT_ATM_CLIP
  80         { cip_if_print,         DLT_ATM_CLIP },
  81 #endif
  82 #ifdef DLT_IP_OVER_FC
  83         { ipfc_if_print,        DLT_IP_OVER_FC },
  84 #endif
  85         { null_if_print,        DLT_NULL },
  86 #ifdef DLT_LOOP
  87         { null_if_print,        DLT_LOOP },
  88 #endif
  89 #ifdef DLT_APPLE_IP_OVER_IEEE1394
  90         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
  91 #endif
  92 #ifdef DLT_BLUETOOTH_HCI_H4_WITH_PHDR
  93         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
  94 #endif
  95 #ifdef DLT_LANE8023
  96         { lane_if_print,        DLT_LANE8023 },
  97 #endif
  98         { arcnet_if_print,      DLT_ARCNET },
  99 #ifdef DLT_ARCNET_LINUX
 100         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
 101 #endif
 102         { raw_if_print,         DLT_RAW },
 103 #ifdef DLT_IPV4
 104         { raw_if_print,         DLT_IPV4 },
 105 #endif
 106 #ifdef DLT_IPV6
 107         { raw_if_print,         DLT_IPV6 },
 108 #endif
 109 #ifdef DLT_USB_LINUX
 110         { usb_linux_48_byte_if_print, DLT_USB_LINUX},
 111 #endif /* DLT_USB_LINUX */
 112 #ifdef DLT_USB_LINUX_MMAPPED
 113         { usb_linux_64_byte_if_print, DLT_USB_LINUX_MMAPPED},
 114 #endif /* DLT_USB_LINUX_MMAPPED */
 115 #ifdef DLT_SYMANTEC_FIREWALL
 116         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 117 #endif
 118 #ifdef DLT_C_HDLC
 119         { chdlc_if_print,       DLT_C_HDLC },
 120 #endif
 121 #ifdef DLT_HDLC
 122         { chdlc_if_print,       DLT_HDLC },
 123 #endif
 124 #ifdef DLT_PPP_ETHER
 125         { pppoe_if_print,       DLT_PPP_ETHER },
 126 #endif
 127 #if defined(DLT_PFLOG) && defined(HAVE_NET_IF_PFLOG_H)
 128         { pflog_if_print,       DLT_PFLOG },
 129 #endif
 130         { token_if_print,       DLT_IEEE802 },
 131         { fddi_if_print,        DLT_FDDI },
 132 #ifdef DLT_LINUX_SLL
 133         { sll_if_print,         DLT_LINUX_SLL },
 134 #endif
 135 #ifdef DLT_LINUX_SLL2
 136         { sll2_if_print,        DLT_LINUX_SLL2 },
 137 #endif
 138 #ifdef DLT_FR
 139         { fr_if_print,          DLT_FR },
 140 #endif
 141 #ifdef DLT_FRELAY
 142         { fr_if_print,          DLT_FRELAY },
 143 #endif
 144 #ifdef DLT_MFR
 145         { mfr_if_print,         DLT_MFR },
 146 #endif
 147         { atm_if_print,         DLT_ATM_RFC1483 },
 148 #ifdef DLT_SUNATM
 149         { sunatm_if_print,      DLT_SUNATM },
 150 #endif
 151 #ifdef DLT_ENC
 152         { enc_if_print,         DLT_ENC },
 153 #endif
 154         { sl_if_print,          DLT_SLIP },
 155 #ifdef DLT_SLIP_BSDOS
 156         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 157 #endif
 158 #ifdef DLT_LTALK
 159         { ltalk_if_print,       DLT_LTALK },
 160 #endif
 161 #ifdef DLT_JUNIPER_ATM1
 162         { juniper_atm1_if_print, DLT_JUNIPER_ATM1 },
 163 #endif
 164 #ifdef DLT_JUNIPER_ATM2
 165         { juniper_atm2_if_print, DLT_JUNIPER_ATM2 },
 166 #endif
 167 #ifdef DLT_JUNIPER_MFR
 168         { juniper_mfr_if_print, DLT_JUNIPER_MFR },
 169 #endif
 170 #ifdef DLT_JUNIPER_MLFR
 171         { juniper_mlfr_if_print, DLT_JUNIPER_MLFR },
 172 #endif
 173 #ifdef DLT_JUNIPER_MLPPP
 174         { juniper_mlppp_if_print, DLT_JUNIPER_MLPPP },
 175 #endif
 176 #ifdef DLT_JUNIPER_PPPOE
 177         { juniper_pppoe_if_print, DLT_JUNIPER_PPPOE },
 178 #endif
 179 #ifdef DLT_JUNIPER_PPPOE_ATM
 180         { juniper_pppoe_atm_if_print, DLT_JUNIPER_PPPOE_ATM },
 181 #endif
 182 #ifdef DLT_JUNIPER_GGSN
 183         { juniper_ggsn_if_print, DLT_JUNIPER_GGSN },
 184 #endif
 185 #ifdef DLT_JUNIPER_ES
 186         { juniper_es_if_print,  DLT_JUNIPER_ES },
 187 #endif
 188 #ifdef DLT_JUNIPER_MONITOR
 189         { juniper_monitor_if_print, DLT_JUNIPER_MONITOR },
 190 #endif
 191 #ifdef DLT_JUNIPER_SERVICES
 192         { juniper_services_if_print, DLT_JUNIPER_SERVICES },
 193 #endif
 194 #ifdef DLT_JUNIPER_ETHER
 195         { juniper_ether_if_print,       DLT_JUNIPER_ETHER },
 196 #endif
 197 #ifdef DLT_JUNIPER_PPP
 198         { juniper_ppp_if_print, DLT_JUNIPER_PPP },
 199 #endif
 200 #ifdef DLT_JUNIPER_FRELAY
 201         { juniper_frelay_if_print,      DLT_JUNIPER_FRELAY },
 202 #endif
 203 #ifdef DLT_JUNIPER_CHDLC
 204         { juniper_chdlc_if_print,       DLT_JUNIPER_CHDLC },
 205 #endif
 206 #ifdef DLT_PKTAP
 207         { pktap_if_print,       DLT_PKTAP },
 208 #endif
 209 #ifdef DLT_IEEE802_11_RADIO
 210         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 211 #endif
 212 #ifdef DLT_IEEE802_11
 213         { ieee802_11_if_print,  DLT_IEEE802_11},
 214 #endif
 215 #ifdef DLT_IEEE802_11_RADIO_AVS
 216         { ieee802_11_radio_avs_if_print,        DLT_IEEE802_11_RADIO_AVS },
 217 #endif
 218 #ifdef DLT_PRISM_HEADER
 219         { prism_if_print,       DLT_PRISM_HEADER },
 220 #endif
 221         { ppp_if_print,         DLT_PPP },
 222 #ifdef DLT_PPP_WITHDIRECTION
 223         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 224 #endif
 225 #ifdef DLT_PPP_BSDOS
 226         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 227 #endif
 228 #ifdef DLT_PPP_SERIAL
 229         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 230 #endif
 231 #ifdef DLT_DSA_TAG_BRCM
 232         { brcm_tag_if_print,    DLT_DSA_TAG_BRCM },
 233 #endif
 234 #ifdef DLT_DSA_TAG_BRCM_PREPEND
 235         { brcm_tag_prepend_if_print, DLT_DSA_TAG_BRCM_PREPEND },
 236 #endif
 237 #ifdef DLT_VSOCK
 238         { vsock_if_print,       DLT_VSOCK },
 239 #endif
 240         { NULL,                 0 },
 241 };
 242
 243 static void     ndo_default_print(netdissect_options *ndo, const u_char *bp,
 244                     u_int length);
 245
 246 static void NORETURN ndo_error(netdissect_options *ndo,
 247                      status_exit_codes_t status,
 248                      FORMAT_STRING(const char *fmt), ...)
 249                      PRINTFLIKE(3, 4);
 250 static void     ndo_warning(netdissect_options *ndo,
 251                     FORMAT_STRING(const char *fmt), ...)
 252                     PRINTFLIKE(2, 3);
 253
 254 static int      ndo_printf(netdissect_options *ndo,
 255                      FORMAT_STRING(const char *fmt), ...)
 256                      PRINTFLIKE(2, 3);
 257
 258 void
 259 init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
 260 {
 261
 262         init_addrtoname(ndo, localnet, mask);
 263         init_checksum();
 264 }
 265
 266 if_printer
 267 lookup_printer(int type)
 268 {
 269         const struct printer *p;
 270
 271         for (p = printers; p->f; ++p)
 272                 if (type == p->type)
 273                         return p->f;
 274
 275 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 276         /*
 277          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 278          * header.
 279          *
 280          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 281          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 282          * other OSes, to LINKTYPE_PKTAP, so files written with
 283          * this version of libpcap for a DLT_PKTAP capture have a link-
 284          * layer header type of LINKTYPE_PKTAP.
 285          *
 286          * However, files written on OS X Mavericks for a DLT_PKTAP
 287          * capture have a link-layer header type of LINKTYPE_USER2.
 288          * If we don't have a printer for DLT_USER2, and type is
 289          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 290          * that.
 291          */
 292         if (type == DLT_USER2) {
 293                 for (p = printers; p->f; ++p)
 294                         if (DLT_PKTAP == p->type)
 295                                 return p->f;
 296         }
 297 #endif
 298
 299         return NULL;
 300         /* NOTREACHED */
 301 }
 302
 303 int
 304 has_printer(int type)
 305 {
 306         return (lookup_printer(type) != NULL);
 307 }
 308
 309 if_printer
 310 get_if_printer(netdissect_options *ndo, int type)
 311 {
 312         const char *dltname;
 313         if_printer printer;
 314
 315         printer = lookup_printer(type);
 316         if (printer == NULL) {
 317                 dltname = pcap_datalink_val_to_name(type);
 318                 if (dltname != NULL)
 319                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 320                                           "packet printing is not supported for link type %s: use -w",
 321                                           dltname);
 322                 else
 323                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 324                                           "packet printing is not supported for link type %d: use -w", type);
 325         }
 326         return printer;
 327 }
 328
 329 void
 330 pretty_print_packet(netdissect_options *ndo, const struct pcap_pkthdr *h,
 331                     const u_char *sp, u_int packets_captured)
 332 {
 333         u_int hdrlen = 0;
 334         int invalid_header = 0;
 335
 336         if (ndo->ndo_packet_number)
 337                 ND_PRINT("%5u  ", packets_captured);
 338
 339         /* Sanity checks on packet length / capture length */
 340         if (h->caplen == 0) {
 341                 invalid_header = 1;
 342                 ND_PRINT("[Invalid header: caplen==0");
 343         }
 344         if (h->len == 0) {
 345                 if (!invalid_header) {
 346                         invalid_header = 1;
 347                         ND_PRINT("[Invalid header:");
 348                 } else
 349                         ND_PRINT(",");
 350                 ND_PRINT(" len==0");
 351         } else if (h->len < h->caplen) {
 352                 if (!invalid_header) {
 353                         invalid_header = 1;
 354                         ND_PRINT("[Invalid header:");
 355                 } else
 356                         ND_PRINT(",");
 357                 ND_PRINT(" len(%u) < caplen(%u)", h->len, h->caplen);
 358         }
 359         if (h->caplen > MAXIMUM_SNAPLEN) {
 360                 if (!invalid_header) {
 361                         invalid_header = 1;
 362                         ND_PRINT("[Invalid header:");
 363                 } else
 364                         ND_PRINT(",");
 365                 ND_PRINT(" caplen(%u) > %u", h->caplen, MAXIMUM_SNAPLEN);
 366         }
 367         if (h->len > MAXIMUM_SNAPLEN) {
 368                 if (!invalid_header) {
 369                         invalid_header = 1;
 370                         ND_PRINT("[Invalid header:");
 371                 } else
 372                         ND_PRINT(",");
 373                 ND_PRINT(" len(%u) > %u", h->len, MAXIMUM_SNAPLEN);
 374         }
 375         if (invalid_header) {
 376                 ND_PRINT("]\n");
 377                 return;
 378         }
 379
 380         /*
 381          * At this point:
 382          *   capture length != 0,
 383          *   packet length != 0,
 384          *   capture length <= MAXIMUM_SNAPLEN,
 385          *   packet length <= MAXIMUM_SNAPLEN,
 386          *   packet length >= capture length.
 387          *
 388          * Currently, there is no D-Bus printer, thus no need for
 389          * bigger lengths.
 390          */
 391
 392         ts_print(ndo, &h->ts);
 393
 394         /*
 395          * Printers must check that they're not walking off the end of
 396          * the packet.
 397          * Rather than pass it all the way down, we set this member
 398          * of the netdissect_options structure.
 399          */
 400         ndo->ndo_snapend = sp + h->caplen;
 401
 402         ndo->ndo_protocol = "";
 403         if (setjmp(ndo->ndo_truncated) == 0) {
 404                 /* Print the packet. */
 405                 hdrlen = (ndo->ndo_if_printer)(ndo, h, sp);
 406         } else {
 407                 /* A printer quit because the packet was truncated; report it */
 408                 ND_PRINT(" [|%s]", ndo->ndo_protocol);
 409         }
 410
 411         /*
 412          * Free all pushed buffers; if we got here by a printer quitting,
 413          * we need to release anything that didn't get released because
 414          * we longjmped out of the code before it popped a buffer.
 415          */
 416         nd_pop_all_buffers(ndo);
 417
 418         /*
 419          * Restore the original snapend, as a printer might have
 420          * changed it.
 421          */
 422         ndo->ndo_snapend = sp + h->caplen;
 423         if (ndo->ndo_Xflag) {
 424                 /*
 425                  * Print the raw packet data in hex and ASCII.
 426                  */
 427                 if (ndo->ndo_Xflag > 1) {
 428                         /*
 429                          * Include the link-layer header.
 430                          */
 431                         hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
 432                 } else {
 433                         /*
 434                          * Don't include the link-layer header - and if
 435                          * we have nothing past the link-layer header,
 436                          * print nothing.
 437                          */
 438                         if (h->caplen > hdrlen)
 439                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 440                                                     h->caplen - hdrlen);
 441                 }
 442         } else if (ndo->ndo_xflag) {
 443                 /*
 444                  * Print the raw packet data in hex.
 445                  */
 446                 if (ndo->ndo_xflag > 1) {
 447                         /*
 448                          * Include the link-layer header.
 449                          */
 450                         hex_print(ndo, "\n\t", sp, h->caplen);
 451                 } else {
 452                         /*
 453                          * Don't include the link-layer header - and if
 454                          * we have nothing past the link-layer header,
 455                          * print nothing.
 456                          */
 457                         if (h->caplen > hdrlen)
 458                                 hex_print(ndo, "\n\t", sp + hdrlen,
 459                                           h->caplen - hdrlen);
 460                 }
 461         } else if (ndo->ndo_Aflag) {
 462                 /*
 463                  * Print the raw packet data in ASCII.
 464                  */
 465                 if (ndo->ndo_Aflag > 1) {
 466                         /*
 467                          * Include the link-layer header.
 468                          */
 469                         ascii_print(ndo, sp, h->caplen);
 470                 } else {
 471                         /*
 472                          * Don't include the link-layer header - and if
 473                          * we have nothing past the link-layer header,
 474                          * print nothing.
 475                          */
 476                         if (h->caplen > hdrlen)
 477                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 478                 }
 479         }
 480
 481         ND_PRINT("\n");
 482         nd_free_all(ndo);
 483 }
 484
 485 /*
 486  * By default, print the specified data out in hex and ASCII.
 487  */
 488 static void
 489 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 490 {
 491         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 492 }
 493
 494 /* VARARGS */
 495 static void
 496 ndo_error(netdissect_options *ndo, status_exit_codes_t status,
 497           const char *fmt, ...)
 498 {
 499         va_list ap;
 500
 501         if (ndo->program_name)
 502                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 503         va_start(ap, fmt);
 504         (void)vfprintf(stderr, fmt, ap);
 505         va_end(ap);
 506         if (*fmt) {
 507                 fmt += strlen(fmt);
 508                 if (fmt[-1] != '\n')
 509                         (void)fputc('\n', stderr);
 510         }
 511         nd_cleanup();
 512         exit(status);
 513         /* NOTREACHED */
 514 }
 515
 516 /* VARARGS */
 517 static void
 518 ndo_warning(netdissect_options *ndo, const char *fmt, ...)
 519 {
 520         va_list ap;
 521
 522         if (ndo->program_name)
 523                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 524         (void)fprintf(stderr, "WARNING: ");
 525         va_start(ap, fmt);
 526         (void)vfprintf(stderr, fmt, ap);
 527         va_end(ap);
 528         if (*fmt) {
 529                 fmt += strlen(fmt);
 530                 if (fmt[-1] != '\n')
 531                         (void)fputc('\n', stderr);
 532         }
 533 }
 534
 535 static int
 536 ndo_printf(netdissect_options *ndo, const char *fmt, ...)
 537 {
 538         va_list args;
 539         int ret;
 540
 541         va_start(args, fmt);
 542         ret = vfprintf(stdout, fmt, args);
 543         va_end(args);
 544
 545         if (ret < 0)
 546                 ndo_error(ndo, S_ERR_ND_WRITE_FILE,
 547                           "Unable to write output: %s", pcap_strerror(errno));
 548         return (ret);
 549 }
 550
 551 void
 552 ndo_set_function_pointers(netdissect_options *ndo)
 553 {
 554         ndo->ndo_default_print=ndo_default_print;
 555         ndo->ndo_printf=ndo_printf;
 556         ndo->ndo_error=ndo_error;
 557         ndo->ndo_warning=ndo_warning;
 558 }